Wrench



vIEIDVVIST J. ARMSTRONG, OF ERIE, PENNSYLVANIA,

i MOBRIER, OF ERIE, PENNSYLVANIA.

ASSIGNOR TO FREDERICK B.

WRENCH.

Application mea May 14,

T 0 all tc/2,0m t man; concern.'

j Be it `known that I, EDWIN J'. ARMSTRONG, a citizen of the United States, residing at Erie, in the county of Erie'and State of Pennsylvania, have invented new and useful Improvements in Wrenches, of which the following is a specification.

It is desirable in wrenches to have means provided whereby the movable jaw may `be quickly moved from one adjustment to another and atthe same time to have an adjustment which permits of the exact positioning ofthe movable jaw and a secure locking of the movable This is particularly desirable wherethe complete removal of the movable jaw is of advantage. The desirable features above enumerated are obtained in this invention. Other features will appear from the specification and claims.

'The invention is illustrated in the accompanying drawings as follows Fig. 1 shows a side elevation of the wrench partly in section on the line 1-1 in F ig. 2.

. edge 8 fitting has Fig. 2 is a section on the line 2-2 in F ig. 1. 1 marks the fixed j aw, 2 the shank extend* ing from the fixed aw, 3 a guide-way on the xedjaw, l a guideeslot extending from the` y guide-way,

and 5 anenlarged bore in continuation of the slot 4. x 6 is a movable jaw slidingly mounted on the guide-way 3 and having a tongue 7 ex tending into the groove 1 with an enlarged into the bore 5. The edge of the tongue 7 is provided with a rack 9.

The shank is provided with a screw opening 10 which extends into the bore;` An adjusting screw 11 arranged in this opening and operates on the rack 9. The screw an opening `12 extending axially through it terminating in the conical surfaces 13 at the ends. v f o A bore 14 extends into the shank parallel l with the bore, this bore extending through the walls of the shank at one side of the 10.` The pin is opening 10` and having an extension 15 from "the opposite side ofthe opening 10.

A. pin 16 is slipped into the opening 141-. It is provided with a tapered surface 17 act ing on the surface 13` of the screw and is provided with a ,shoulder-18 `which rests against the wall at the side of the opening ofsuch length that it can j be readily inserted into the openinglO and then intothe opening 14C' in assembling the wrench.

` surface 13 of the screw 1920. Serial No, 381,336.

Amovable or yielding pin 19 is arrangedy l p pins acting in conjunction with the tapered surfaces inthe screw tend to center and hold the screw in axial alinement with the pins and inengagement with the rack 9. Pressure is exerted on thescrew away from the rack and the cammingaction of this pressure on the tapered surface 17 tends to crowd the screw to the left as shown in Fig. 1 carrying with it the pin 19. F urther the camming actionof the screw on the tapered surface 20 of the pin 19 tends to move the pin still farther to the left and consequently permits of a lateral movement of the screw to disengage it from the rack. This movement may be eased somewhat if desired by moving the screw axially toward the left with pressure away from the rack.

In order to prevent the accidental displacement of the screw the pin 19 is provided with a small extension 22 at its end and the pin 16 with a similar extension 23. This engages `the walls of the opening 12 when the screw is thrust away from the rackand prevents the disengagement of the screw entirely from the pins.

The size of the opening 10 is such that the pin 19 may be forced back into its socket a sufficient distance to permit of the placing of the screw over the pin 16 and when in this position the pin 19 may be released locking the screw in place. vThe screw may be removed in the same manner. noted that the tapered surface 17 on the screw 16 receives the end thrust of the movable jaw and this tapered surface backed by the shoulder 18 makes a very rigid and `efiicient bearing for the screw.

It will be noted that the slot in which the tongue of the movable jaw is arranged extends from the face of the shank so that the movable jaw may be slipped out of the guide when the screw is disen aged. The guide is desirable not only to adjust the movable jaw but to permit of its removal.

'It will be What I claim as new is:

1. In a wrench, the combination ot a tixed jaw; a shank on the jaw having a guide for a movable jaw and a screw opening therein; a movable jaw mounted on the guide and having a rack extending into said opening; a screw in said opening operating on said rack; and a bearing tor the screw having axially yielding centering surfaces; centering the screw by axial pressure and permitting a movement ot the screw out of engagement with the rack by the yielding ot said bearing.

2. In a wrench, the combination ot' a ixed jaw; a shank on the iaw having a guide for a movable jaw and a screw opening therein; a movable jaw mounted on the guide and having a rack extending into said opening' a screw in said opening operating on sait rack; an axially yielding pin having a centering end engagement with the screw tending to hold the screw in engagement with the rack; and a spring acting on the pin.

3. In a wrenchJ the combination ot a fixed jaw; a shank on the jaw having a guide for a movable jaw and a screw opening therein; a movable jaw mounted on the guide and having a rack extending into said opening; a screw in said opening operating on said rack; an axially yielding pin having a centering end engagement with the screw tending to hold the screw in engagement with the rack; a spring acting on the pin; and a bearing 'for the opposite end ot .the screw having a tapered engaging surface.

4. In a wrench; the combination of a fixed jaw; a shank on the jaw having a guide 'For a movable jaw, a screw opening therein and bearing pin openings in the shank extending in alinement from opposite sides ot' the screw opening; a screw in the opening having a tapered surface centering` with the axis ot the pin openings; a pin lixed in one opening and receiving the thrust of the screw g an axially yielding pin with a tapered surface in the opposite opening engaging the screw with its tapered surface Yand yieldingly holding the screw in place; and a spring in the opening back of said yielding pin.

5. In a wrench; the combination of a lixed jaw; a shank on the jaw having a guide for a movable jaw, a screw opening therein and bearing pin openings in the shank extending in alinement from opposite sides or" the screw openings; a movable `iaw operating on said guide; a screw arranged in the opening operating on the movable jaw; said screw having a tapered bearing sui-tare; a pin fixed in one opening receiving the thrust ot the screw; an axially yielding pin provided with a tapered surface in the opposite opening engaging the screw with a tapered surtace and yieldingly holding the screw in place; and a spring in the opening back oil said yielding pin, one of said pins having an extension of small diameter preventing the accidental removal ot the screw.

6. In a wrench; the combination ol' a lixed jaw; a shank on the `iaw having a guide tor a movable jaw, a screw opening therein and bearing pin openings in the shank extending in alinement from opposite sides ot the screw opening; a movable jaw operating on said guide; a screw ar angcd in the opening operating on the movable jaw7 said screw having a tapered bearing sur'laee; a pin fixed in one opening receiving the thrust ot the screw; an axially yielding pin provided with a tapered sui-tace in the oppo- 'site Opening engaging the screw with its tapered surface and yieldingly holding the screw in place; and a springr in the opening back of said yielding pin; both ol said pins having an extension of small diameter preventing the accidental removal of the screw.

7. In a wrench, the combination o't a lixed jaw; a shank extending thereirom having a guide tor a movable awj a screw opening and a bearing pin opening extending `trom the walls ot the screw opening: a movable jaw on the guide having a rack extending into the screw opening; a screw operating on the rack7 said screw having a central opening with tapered ends; a bearing pin having its tapered surface receiving the thrust of the screw7 said bearing pin beingarranged in one ot the screw bearing openings and having a shoulder engaging the wall of the screw opening; a movable pin arranged in the opposite opening, said pin having tapered bearing surfaces centering the screw; and a spring in the opening back ot the movable pin.

8, In a wrench; the combination ot a iaw actuating rack; a screw operating` on the rack; and a bearing for the screw compris- .ing an axially yielding pin having a tapered surface engaging the screw. the yielding o li the pin through pressure on said surface permitting a movement ot the screw out ot engage-nient with the rack.

9. In a wrench, the combination ol a jaw actuating rack; a screw operating on the rack; and end bearings tor the screw; one ot' said bearings being in the torni ot a tapered pin adapted to receive the thrust ot the screw and tending to center the screw; the other ot said bearings being in the form of `an axially `vielding pin having a tapered surface engaging the screw and tending to center the screw; the yielding ot said `vielding pin permitting a movement ot the screw out ot engagement with the rack.

In testimony whereof I have hereunto set my hand.

.EDNIN J. ARMSTRONG. 

